Why do arterties do not have valves but veins have valves and cappilaries don't have valves
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The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. ... Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.)
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because arteries passes blood to all body parts if these artery passing blood flow through any part accept lung there is no problem
but veins receives deoxigenated blood that blood should not flow through all parts,if that blood flows then that particular part will damage veins helps in stop to pass any deoxigenated blood to oxigenised part
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